Abstract Indonesia is located between three significant plate confluences that play a role in creating subduction zone. Sumatra, one of Indonesia’s provinces, near the collision Eurasian Plate, Indo-Australian and Pacific Plate. The Semangko Fault, Mentawai Islands, chain non-volcanic forearc islands, active faults induce earthquakes landslides are all produced by zones on Sumatra Island. recei...

nowadays, in the modern wars, radars have faced with many threats. therefore, low probability of interception (lpi) capability is considered as an important factor in military radars. on the other hand, research on the interception of their signals is started and so far several methods are presented for detection of these signals. by using of time-frequency techniques, we can estimate signal pa...